We build a bipolar CSM into which the jet-driven explosion occurs. The manner by which we built the CSM is not so important. We expect a CEE or a GEE to form such a bipolar CSM. The explosion then takes place into the bipolar CSM.
Namely, the CSM is formed and shaped, for example, by a precursor where the CCSN progenitor expands few years before the explosion and engulfs a companion that launches jets (e.g., [1]}, [2]}, [3]}).
Core activity of excitation of waves (e.g., [4]}, [5]}, [6]}, [7]}, [8]}) or magnetic activity (e.g., [9]}) causes the envelope expansion years to months before explosion.
